From the GPOADmin Quick Start guide here is the information on setting preferred GCs:
Restricting search scope
If required, you can restrict which global catalogs are used within the forest to search for the GPOADmin server during connection.
To restrict the search scope:
1 Create a file called PreferredGCs.txt.
2 List the fully qualified domain name of each Global Catalog server to include in the search on their own row in the file.
3 Save the file to the installation directory.
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